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Noninvasive measurement of the tissue oxygen uptake using near-infrared spectroscopy
NAKAGAWA, Emiko,MINAMITANI, Haruyuki,YAMAZAKI, Hajime 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
To determine the change in muscle oxygenation, muscle oxygen saturation and hemoglobin volume was measured transcutaneously with near-infrared spectroscopy (MRS) in the skeleton muscle during cycle ergometry. A new NIRS system is presented for noninvasive evaluation of the tissue oxygenation. To measure more simply, a reflectance sensor that consists of one photodiode (PD) and light emitting diodes (LEDs) with three wavelengths was designed. This instrument monitors and evaluates the regional oxygen saturation (rSO_(2)) and volume of hemoglobin (HbI) using hemoglobin index (HbI) more simply and inexpensively for clinical application. Blood volume and oxygen supply to skeletal muscle is a potentially important factor to maintain muscular oxidative metabolism. The vastus lateralis muscle and the brachioradialis muscle of nine healthy men were monitored by NIRS, using cycle ergometry. The oxygen uptake (VO_(2)) was also monitored to evaluate oxidative metabolism. The calculation results of oxidative metabolism with NIRS correlated with both the VO_(2) and work fate. The purpose of this study was to determine whether the O_(2) consumption measured by NIRS with rSO_(2) and HbI can be a quantitative measure of muscle oxidative metabolism.
Sediment Erosion and Transport Experiments in Laboratory using Artificial Rainfall Simulator
Regmi, Ram Krishna,Jung, Kwansue,Nakagawa, Hajime,Kang, Jaewon,Lee, Giha Korean Geo-Environmental Society 2014 한국지반환경공학회논문집 Vol.15 No.4
Catchments soil erosion, one of the most serious problems in the mountainous environment of the world, consists of a complex phenomenon involving the detachment of individual soil particles from the soil mass and their transport, storage and overland flow of rainfall, and infiltration. Sediment size distribution during erosion processes appear to depend on many factors such as rainfall characteristics, vegetation cover, hydraulic flow, soil properties and slope. This study involved laboratory flume experiments carried out under simulated rainfall in a 3.0 m long ${\times}$ 0.8 m wide ${\times}$ 0.7 m deep flume, set at $17^{\circ}$ slope. Five experimental cases, consisting of twelve experiments using three different sediments with two different rainfall conditions, are reported. The experiments consisted of detailed observations of particle size distribution of the out-flow sediment. Sediment water mixture out-flow hydrograph and sediment mass out-flow rate over time, moisture profiles at different points within the soil domain, and seepage outflow were also reported. Moisture profiles, seepage outflow, and movement of overland flow were clearly found to be controlled by water retention function and hydraulic function of the soil. The difference of grain size distribution of original soil bed and the out-flow sediment was found to be insignificant in the cases of uniform sediment used experiments. However, in the cases of non-uniform sediment used experiments the outflow sediment was found to be coarser than the original soil domain. The results indicated that the sediment transport mechanism is the combination of particle segregation, suspension/saltation and rolling along the travel distance.
Sediment Erosion and Transport Experiments in Laboratory using Artificial Rainfall Simulator
Ram Krishna Regmi,Kwansue Jung,Hajime Nakagawa,Jaewon Kang,Giha Lee 한국지반환경공학회 2014 한국지반환경공학회논문집 Vol.15 No.4
Catchments soil erosion, one of the most serious problems in the mountainous environment of the world, consists of a complex phenomenon involving the detachment of individual soil particles from the soil mass and their transport, storage and overland flow of rainfall, and infiltration. Sediment size distribution during erosion processes appear to depend on many factors such as rainfall characteristics, vegetation cover, hydraulic flow, soil properties and slope. This study involved laboratory flume experiments carried out under simulated rainfall in a 3.0 m long × 0.8 m wide × 0.7 m deep flume, set at 17° slope. Five experimental cases, consisting of twelve experiments using three different sediments with two different rainfall conditions, are reported. The experiments consisted of detailed observations of particle size distribution of the out-flow sediment. Sediment water mixture out-flow hydrograph and sediment mass out-flow rate over time, moisture profiles at different points within the soil domain, and seepage outflow were also reported. Moisture profiles, seepage outflow, and movement of overland flow were clearly found to be controlled by water retention function and hydraulic function of the soil. The difference of grain size distribution of original soil bed and the out-flow sediment was found to be insignificant in the cases of uniform sediment used experiments. However, in the cases of non-uniform sediment used experiments the outflow sediment was found to be coarser than the original soil domain. The results indicated that the sediment transport mechanism is the combination of particle segregation, suspension/saltation and rolling along the travel distance.
연안 지역에서의 통합적인 방재대책 구축을 위한 토석류 모델 개발
김연중(Yeon-Joong Kim),윤종성(Jung-Sung Yoon),Nakagawa Hajime,우선봉(Sun-Bong Woo) 한국연안방재학회 2014 한국연안방재학회지 Vol.1 No.4
The characteristics of natural disasters have become increasingly more difficult to predict due to the influence of climate change. In addition, the multi-environment zones (i.e., with various geographical risk factors) have very high potential disaster risks. Multiple debris flow disasters between mountainous areas and coastal, urban areas have occurred simultaneously with flooding disasters caused by heavy, torrential rainfall due to the changing global climate and environment. Preventing the occurrence of disasters with structural and non-structural measures is the most basic approach to disaster prevention. However, in order to mitigate these disasters more effectively, it is necessary to investigate what causes damage and establish a disaster prevention countermeasure according to the integrated system for a several disasters. Therefore, the aims of this study are to estimate the characteristic of debris flow at the fan area, and to establish an integrated plan for preventing disasters by develop an applicable debris flow model for an actual basin. To validate the developed 2-D numerical model, the results of hydraulic model test are compared with the results of the numerical calculation. The parameters of total flow and sediment discharges, sediment concentration, flow pattern, and travel length are measured in hydraulic experiment and used to validate the numerical model. As a result, the simulated results are in good agreement with the experimental results.
Effect of romosozumab in premenopausal women with severe osteoporosis and anorexia nervosa
Kazuki Fujimoto,Narumi Maki,Daisuke Hashiba,Toshifumi Maeyama,Ryosuke Nakagawa,Hajime Arai,Seiji Ohtori 대한골다공증학회 2023 Osteoporosis and Sarcopenia Vol.9 No.4
Objectives: This study aims to investigate the effects of romosozumab on bone mineral density (BMD) and bone metabolism. Methods: In this retrospective case series, romosozumab was administered to 5 premenopausal female patients with osteoporosis and anorexia nervosa with fragility fractures. BMD and bone turnover marker changes were investigated at 6 months and 1 year after administering romosozumab. Results: BMD increased and high-turnover bone metabolism decreased 6 months and 1 year after administering romosozumab. Conclusions: Romosozumab is useful for treating osteoporosis in patients with anorexia nervosa.